There are two new systems for checking passengers. One is called millimeter wave AIT and the other is backscatter x-ray AIT. AIT stands for Advanced Imaging Technology.

Millimeter wave AIT uses radio frequency energy to generate a 3-D image of the body. Energy projected by this technology is about 10 thousand times less than a cell phone transmission.

The backscatter x-ray uses a low-energy x-ray beam to scan the surface of the body at a high speed. Radiation exposure from one backscatter scan is about the same as 2 minutes of flying or 17 minutes of ordinary living.

Also, the full body screening is optional for all passengers, and those who don’t want the full body scan will receive an alternative screening... including a physical pat down.